[ubuntu] Rename build scripts (#8866)

* [ubuntu] Rename build scripts

* [ubuntu] Change reboot to inline shell

* [ubuntu] Move disk space validation to pester tests

* [ubuntu] Rename helper and tests files

* [ubuntu] Changes to cleanup, post-deployment and r scripts

images/ubuntu/scripts/build/configure-apt-mock.sh

@@ -0,0 +1,54 @@
+#!/bin/bash -e
+################################################################################
+##  File:  configure-apt-mock.sh
+##  Desc:  A temporary workaround for https://github.com/Azure/azure-linux-extensions/issues/1238.
+##         Cleaned up during configure-cleanup.sh.
+################################################################################
+
+prefix=/usr/local/bin
+
+for real_tool in /usr/bin/apt /usr/bin/apt-get /usr/bin/apt-fast /usr/bin/apt-key;do
+  tool=`basename $real_tool`
+  cat >$prefix/$tool <<EOT
+#!/bin/sh
+
+i=1
+while [ \$i -le 30 ];do
+  err=\$(mktemp)
+  $real_tool "\$@" 2>\$err
+
+  # no errors, break the loop and continue normal flow
+  test -f \$err || break
+  cat \$err >&2
+
+  retry=false
+
+  if grep -q 'Could not get lock' \$err;then
+    # apt db locked needs retry
+    retry=true
+  elif grep -q 'Could not open file /var/lib/apt/lists' \$err;then
+    # apt update is not completed, needs retry
+    retry=true
+  elif grep -q 'IPC connect call failed' \$err;then
+    # the delay should help with gpg-agent not ready
+    retry=true
+  elif grep -q 'Temporary failure in name resolution' \$err;then
+    # It looks like DNS is not updated with random generated hostname yet
+    retry=true
+  elif grep -q 'dpkg frontend is locked by another process' \$err;then
+    # dpkg process is busy by another process
+    retry=true
+  fi
+
+  rm \$err
+  if [ \$retry = false ]; then
+    break
+  fi
+
+  sleep 5
+  echo "...retry \$i"
+  i=\$((i + 1))
+done
+EOT
+  chmod +x $prefix/$tool
+done